Youre in the right colors to dig for cards with a wheels theme, and Elenda and Azor is a good piece to help you get a wider, more conniving board
Morph is not an obviously powerful mechanic, but the ability to commit creatures to your board without having to be concerned with the exact colors you can produce from your lands means that you always have some agency in the game
Scars of Mirrodin cared about -1/-1 counters and poison counters
Slap the Lightning Greaves on The War Doctor and play a Swords to Plowshares on a blocker, ping a mana dork, and get another counter
Old Gnawbone or Hullbreaker Horror come to mind to be a nuisance to your opponents, but Im sure there are other options as well
You can focus on the food theme, the golems, or the ability to resurrect anything you sacrifice and double up all your ETB effects